Shears.



A. N. EASTMAN.

SHEARS.

APPLIOATION FILED AUG. 13, 1904.

fiVfT/VESSES: [NVE/VTOR. c. W

ATTORNEY.

PATENTED MAR. 6, 1906.

ALBERT N. EASTMAN, OF CHICAGO, ILLINOIS.

SH EARS.

Specification of Letters Patent.

Patented March 6, 1906.

Application filed August 13. 1904. Serial No. 220,690.

To all whom it may concern:

Be it known that I, ALBERT N. EASTMAN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Shears, of which thefollowing is a specification.

In cutting with a pair of shears or scissors it is necessary to pullupon one of the handles connected to the blade with the fingers and topush on the other with the thumb in order that the blades may be insheer during the cutting operation. Numerous springs have been inventedto hold the blades in sheer during the cutting operation. The ones withwhich I am familiar exert a pressure upon the blade from the outside andbetween the pivotscrew and the cutting edge of the shears 0r scissors.

The object'of my invention is to produce a spring which will as nearlyas possible duplicate the action of the human hand in the use of shearsand to furnish a spring of onethird the strength whose tension willproduce a sheer cut by separating the blades back of the pivot-screwbetween the screw and the handle. As the screw acts as the fulcrum forthe different styles of springs for shears or scissors and since saidscrew is nearly always located very near to the cutting edge, it isnecessary to have a spring of considerable strength. By the use ofmyimproved sprin located, as it is, three times as farfrom the fucrum,it is apparent that a spring of one-third the strength will producethe same result.

My method of obtaining the fore oing object may be more readilyunderstood by having reference to the accompanying drawings, which are apart of this specification and which are hereunto annexed, in whichFigure 1 is a plan view of a pair of shears with my improved springattached thereto. Fig. 2 is a side elevation of the same. Fig. 3 is anenlarged detail, partly in section, of my improved device.

together by a pivot-screw 0.

Similar letters refer to similar parts throughout the entiredescription.

In the drawings, a is a pair of shears having handles of the usualconstruction. The handles are connected to the blades by the usualshanks, and the blades are connected Between the handles and the shanksis a wire spring a. This spring is formed somewhat in the shape ofapear, having a coil (1 at its bend, the ends a of the wire being bentat right angles to itself. Grooves a are cut into the inner portion ofthe blades, and a hole or, is drilled at the ends of said grooves. Theends a of the spring are then inserted into the holes a the spring lyingin the recess or grooves a permitting the shears to pass over each otherin closing. The action of the spring is outward, pushing against theblades similar to the action of the human hand, and as the s ring islocated a great deal farther from the lcrum formed by the pivot-screw cit necessarily follows that a spring of much less strength will producethe desired result.

Having described my invention, what I regard as new, and desire tosecure by Letters Patent, is

A pair of scissors or shears in combination with a pear-shaped spring,said spring having an outward .tension, said spring having its'armsfitted to and coinciding with grooves formed on the inside face of theshears and connected thereto back of the pivot-screw and so located asto increase its leverage for the purpose set forth substantially asdescribed.

In testimony whereof I have set my hand before two subscribingwitnesses.

ALBERT N. EASTMAN.

Witnesses:

EDWARD P. EAsTMAN, MAUDE M. CUTLER.

